//  -------------------- iSharePoint -------------------- //
// 
//  Company:	IT Complex, LLC
//  Project:	Smart.Common
//  File name:	SyncList.cs
//  Developer:	Solomatov Igor
//  Created:	15.04.2012
// 
//  -------------------- iSharePoint -------------------- //

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;

namespace Smart
{
	/// <summary>
	/// Sync list
	/// </summary>
	[Serializable]
	[DebuggerStepThrough]
	public class SyncList<TValueType> : IList<TValueType>
	{
		public List<TValueType> Storage;

		[NonSerialized] private readonly ReaderWriterLockSlim _sync = new ReaderWriterLockSlim(LockRecursionPolicy.NoRecursion);

		public SyncList()
		{
			Storage = new List<TValueType>();
		}

		public SyncList(IEnumerable<TValueType> values)
		{
			Storage = new List<TValueType>(values);
		}

		/// <summary>
		/// Returns an enumerator that iterates through the collection.
		/// </summary>
		/// <returns>
		/// A <see cref="T:System.Collections.Generic.IEnumerator`1"/> that can be used to iterate through the collection.
		/// </returns>
		/// <filterpriority>1</filterpriority>
		public IEnumerator<TValueType> GetEnumerator()
		{
			_sync.EnterReadLock();

			try
			{
				var tmp = new List<TValueType>(this);

				return tmp.GetEnumerator();
			}
			finally
			{
				_sync.ExitReadLock();
			}
		}

		/// <summary>
		/// Returns an enumerator that iterates through a collection.
		/// </summary>
		/// <returns>
		/// An <see cref="T:System.Collections.IEnumerator"/> object that can be used to iterate through the collection.
		/// </returns>
		/// <filterpriority>2</filterpriority>
		IEnumerator IEnumerable.GetEnumerator()
		{
			_sync.EnterReadLock();

			try
			{
				var tmp = new List<TValueType>(this);

				return tmp.GetEnumerator();
			}
			finally
			{
				_sync.ExitReadLock();
			}
		}

		/// <summary>
		/// Adds an item to the <see cref="T:System.Collections.Generic.ICollection`1"/>.
		/// </summary>
		/// <param name="item">The object to add to the <see cref="T:System.Collections.Generic.ICollection`1"/>.</param><exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only.</exception>
		public void Add(TValueType item)
		{
			_sync.EnterWriteLock();

			try
			{
				Storage.Add(item);
			}
			finally
			{
				_sync.ExitWriteLock();
			}
		}

		/// <summary>
		/// Removes all items from the <see cref="T:System.Collections.Generic.ICollection`1"/>.
		/// </summary>
		/// <exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only. </exception>
		public void Clear()
		{
			_sync.EnterWriteLock();

			try
			{
				Storage.Clear();
			}
			finally
			{
				_sync.ExitWriteLock();
			}
		}

		/// <summary>
		/// Determines whether the <see cref="T:System.Collections.Generic.ICollection`1"/> contains a specific value.
		/// </summary>
		/// <returns>
		/// true if <paramref name="item"/> is found in the <see cref="T:System.Collections.Generic.ICollection`1"/>; otherwise, false.
		/// </returns>
		/// <param name="item">The object to locate in the <see cref="T:System.Collections.Generic.ICollection`1"/>.</param>
		public bool Contains(TValueType item)
		{
			_sync.EnterReadLock();

			try
			{
				return Storage.Contains(item);
			}
			finally
			{
				_sync.ExitReadLock();
			}
		}

		/// <summary>
		/// Copies the elements of the <see cref="T:System.Collections.Generic.ICollection`1"/> to an <see cref="T:System.Array"/>, starting at a particular <see cref="T:System.Array"/> index.
		/// </summary>
		/// <param name="array">The one-dimensional <see cref="T:System.Array"/> that is the destination of the elements copied from <see cref="T:System.Collections.Generic.ICollection`1"/>. The <see cref="T:System.Array"/> must have zero-based indexing.</param><param name="arrayIndex">The zero-based index in <paramref name="array"/> at which copying begins.</param><exception cref="T:System.ArgumentNullException"><paramref name="array"/> is null.</exception><exception cref="T:System.ArgumentOutOfRangeException"><paramref name="arrayIndex"/> is less than 0.</exception><exception cref="T:System.ArgumentException"><paramref name="array"/> is multidimensional.-or-<paramref name="arrayIndex"/> is equal to or greater than the length of <paramref name="array"/>.-or-The number of elements in the source <see cref="T:System.Collections.Generic.ICollection`1"/> is greater than the available space from <paramref name="arrayIndex"/> to the end of the destination <paramref name="array"/>.-or-Type <paramref name="T"/> cannot be cast automatically to the type of the destination <paramref name="array"/>.</exception>
		public void CopyTo(TValueType[] array, int arrayIndex)
		{
			_sync.EnterReadLock();

			try
			{
				Storage.CopyTo(array, arrayIndex);
			}
			finally
			{
				_sync.ExitReadLock();
			}
		}

		/// <summary>
		/// Removes the first occurrence of a specific object from the <see cref="T:System.Collections.Generic.ICollection`1"/>.
		/// </summary>
		/// <returns>
		/// true if <paramref name="item"/> was successfully removed from the <see cref="T:System.Collections.Generic.ICollection`1"/>; otherwise, false. This method also returns false if <paramref name="item"/> is not found in the original <see cref="T:System.Collections.Generic.ICollection`1"/>.
		/// </returns>
		/// <param name="item">The object to remove from the <see cref="T:System.Collections.Generic.ICollection`1"/>.</param><exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only.</exception>
		public bool Remove(TValueType item)
		{
			_sync.EnterWriteLock();

			try
			{
				return Storage.Remove(item);
			}
			finally
			{
				_sync.ExitWriteLock();
			}
		}

		/// <summary>
		/// Gets the number of elements contained in the <see cref="T:System.Collections.Generic.ICollection`1"/>.
		/// </summary>
		/// <returns>
		/// The number of elements contained in the <see cref="T:System.Collections.Generic.ICollection`1"/>.
		/// </returns>
		public int Count
		{
			get
			{
				_sync.EnterReadLock();

				try
				{
					return Storage.Count;
				}
				finally
				{
					_sync.ExitReadLock();
				}
			}
		}

		/// <summary>
		/// Gets a value indicating whether the <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only.
		/// </summary>
		/// <returns>
		/// true if the <see cref="T:System.Collections.Generic.ICollection`1"/> is read-only; otherwise, false.
		/// </returns>
		public bool IsReadOnly
		{
			get
			{
				_sync.EnterReadLock();

				try
				{
					return false;
				}
				finally
				{
					_sync.ExitReadLock();
				}
			}
		}

		/// <summary>
		/// Determines the index of a specific item in the <see cref="T:System.Collections.Generic.IList`1"/>.
		/// </summary>
		/// <returns>
		/// The index of <paramref name="item"/> if found in the list; otherwise, -1.
		/// </returns>
		/// <param name="item">The object to locate in the <see cref="T:System.Collections.Generic.IList`1"/>.</param>
		public int IndexOf(TValueType item)
		{
			_sync.EnterReadLock();

			try
			{
				return Storage.IndexOf(item);
			}
			finally
			{
				_sync.ExitReadLock();
			}
		}

		/// <summary>
		/// Inserts an item to the <see cref="T:System.Collections.Generic.IList`1"/> at the specified index.
		/// </summary>
		/// <param name="index">The zero-based index at which <paramref name="item"/> should be inserted.</param><param name="item">The object to insert into the <see cref="T:System.Collections.Generic.IList`1"/>.</param><exception cref="T:System.ArgumentOutOfRangeException"><paramref name="index"/> is not a valid index in the <see cref="T:System.Collections.Generic.IList`1"/>.</exception><exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.IList`1"/> is read-only.</exception>
		public void Insert(int index, TValueType item)
		{
			_sync.EnterWriteLock();

			try
			{
				Storage.Insert(index, item);
			}
			finally
			{
				_sync.ExitWriteLock();
			}
		}

		/// <summary>
		/// Removes the <see cref="T:System.Collections.Generic.IList`1"/> item at the specified index.
		/// </summary>
		/// <param name="index">The zero-based index of the item to remove.</param><exception cref="T:System.ArgumentOutOfRangeException"><paramref name="index"/> is not a valid index in the <see cref="T:System.Collections.Generic.IList`1"/>.</exception><exception cref="T:System.NotSupportedException">The <see cref="T:System.Collections.Generic.IList`1"/> is read-only.</exception>
		public void RemoveAt(int index)
		{
			_sync.EnterWriteLock();

			try
			{
				Storage.RemoveAt(index);
			}
			finally
			{
				_sync.ExitWriteLock();
			}
		}

		/// <summary>
		/// Gets or sets the element at the specified index.
		/// </summary>
		/// <returns>
		/// The element at the specified index.
		/// </returns>
		/// <param name="index">The zero-based index of the element to get or set.</param><exception cref="T:System.ArgumentOutOfRangeException"><paramref name="index"/> is not a valid index in the <see cref="T:System.Collections.Generic.IList`1"/>.</exception><exception cref="T:System.NotSupportedException">The property is set and the <see cref="T:System.Collections.Generic.IList`1"/> is read-only.</exception>
		public TValueType this[int index]
		{
			get
			{
				_sync.EnterReadLock();

				try
				{
					return Storage[index];
				}
				finally
				{
					_sync.ExitReadLock();
				}
			}
			set
			{
				_sync.EnterWriteLock();

				try
				{
					Storage[index] = value;
				}
				finally
				{
					_sync.ExitWriteLock();
				}
			}
		}
	}
}